Non-dispersive infrared gas analyzer

ABSTRACT

An improved non-dispersive infrared gas analyzer is disclosed in which beams of infrared energy are passed through cells containing a reference gas, and a sample gas to be analyzed. The relative absorption of the infrared energy by the gases is measured by a detector and used as an indication of gas concentration. A novel optical system is employed which shapes the beams entering and exiting the cells in a manner which ensures that the waveforms of the resultant beams striking the detector from the measurement and reference cells are identical. A novel electronic control system is disclosed which periodically and automatically adjusts the zero reference level of the analyzer.



